1318245840 has 480 divisors, whose sum is σ = 5004679680. Its totient is φ = 321366528.

The previous prime is 1318245833. The next prime is 1318245857. The reversal of 1318245840 is 485428131.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1318245795 and 1318245804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15882439 + ... + 15882521.

It is an arithmetic number, because the mean of its divisors is an integer number (10426416).

Almost surely, 2^1318245840 is an apocalyptic number.

1318245840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1318245840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2502339840).

1318245840 is an abundant number, since it is smaller than the sum of its proper divisors (3686433840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1318245840 is a wasteful number, since it uses less digits than its factorization.

1318245840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1318245840 is about 36307.6553911155. The cubic root of 1318245840 is about 1096.4751744601.

The spelling of 1318245840 in words is "one billion, three hundred eighteen million, two hundred forty-five thousand, eight hundred forty".